Unit displays E8 and shuts down; may be accompanied by very low airflow or ice on the indoor coil.

Safety: Turn off power and wait for the fan to stop completely before working near the blower.

Steps:

• Check filter and coil: Remove and clean or replace the air filter. Inspect the evaporator coil for dust buildup and clean carefully if needed.
• Inspect blower wheel: Remove the front panel and look at the blower wheel. Clear any debris and ensure it spins freely by hand.
• Fan motor test: With power off, check the fan motor wiring and connector. Look for burnt smell or discoloration.
• Capacitor (if equipped): On window and some wall units, test or replace the indoor fan capacitor if the motor hums but does not start.
• Power test (advanced): With power on and extreme caution, verify that the PCB is sending voltage to the fan motor when fan is commanded ON. If voltage is present but the motor does not run, replace the motor.
• PCB check: If no voltage is sent to a known-good motor, the indoor PCB fan driver may be defective and require replacement.

Warning: Do not run the unit with the blower not operating; this can cause coil icing and compressor damage.